class_docstr: Base class for containers.
  
  Containers are classes that collect semantically related Artists such as
  the bars of a bar plot.
class_docstr_tok: ["Base","class","for","containers",".","Containers","are","classes","that","collect","semantically","related","Artists","such","as","the","bars","of","a","bar","plot","."]
code: def __init__(self, kl, label=None):
      self._callbacks = cbook.CallbackRegistry(signals=["pchanged"])
      self._remove_method = None
      self._label = str(label) if label is not None else None
  
file_path: catboost/contrib/python/matplotlib/py3/matplotlib/container.py
imports: from matplotlib import cbook
  from matplotlib.artist import Artist
label_desc: Use image node_id 3 to create a new Container object from inherited base classes: tuple with example: obj = Container(kl, label)